Do the roundabouts on either side of the Chunnel experience higher than normal collisions?
Some years ago, a business contact, knowing my wife and I made occasional visits to London on theater (i.e., theatre) junkets, asked me whether I ever rented a car at Heathrow. He and his wife were planning a first-ever trip to London, and thence to the Lake District and Scotland, and he figured the most efficient way to get from hither to thither to yon would be to rent a car at the airport—because that's how we do it in North America.
Needless to say, I recoiled in horror. I explained that nobody in his right mind except a cab driver would drive a car in central London. I don't think the Heathrow Express existed in those days, but I recommended that he use the Underground to get to the vicinity of his London hotel or, if he wanted to splurge, a black cab, then take a train to his next destination and, if he really wanted to drive the rest of the way, to rent a car there.
He thought I was exaggerating. He rented the car anyway.
After he returned to the States, I asked him whether he enjoyed the trip. He did, but he admitted to a mishap while they were heading out of London. He had entered a roundabout, and quickly became disoriented by the traffic: wrong direction, wrong side of the road. He realized the car was moving too fast, and tried to grab the shift lever to move to a lower gear. Alas, what he actually grabbed was the door handle. The car door was pushed open by centrifugal force and it was all he could do to hold onto it while circling the roundabout. Which, he claimed, he did at least two or three times because, between the disorientation, the excessive speed, and his attempt to hold the door in place made it impossible for him to decide where to exit.
There are a few cities we have visited where I would never consider driving, regardless of which side of the street is used. New York and London are at the top of the list, mostly because we have more experience with them and are familiar with their public transportation systems, but Bangkok, Tokyo, and Taipei are certainly in the same league. I might be tempted to drive in Singapore, except that unless you know exactly where you are going to be able to park you will never be able to get out of the car; downtown Montreal is also a parking nightmare, as I recall (but it's been a while).
Come to think of it, if the pandemic ever ends and we are able to start traveling again, I think I've reached the age and attained the wisdom to pay someone to drive us around.